When evaluating cargo bikes, prioritize the frame material, typically 6061 Aluminum Alloy for a balance of weight and strength, or Chromoly Steel for heavy-duty durability. For electric versions (e-cargo bikes), ensure the motor is a mid-drive system (e.g., Bafang or Bosch) with at least 80Nm of torque to handle heavy loads on inclines. The battery capacity should be a minimum of 48V 15Ah (720Wh) using Samsung or LG cells to ensure longevity and safety. Additionally, look for hydraulic disc brakes (e.g., Tektro or Shimano) which are essential for stopping power when the bike is fully loaded.